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Why does TreeSize Free show different size values than Windows
Explorer?

These differences can occur because the free version does not take all NTFS-specific features into account.
TreeSize Free recognizes compressed and sparse files. The new compression methods LZX and XPress, introduced with Windows 10, are supported with TreeSize Free v4.1 and above.
Features like Alternate Data Streams (ADS), Deduplication (Windows Server 2012 and above) or recognition of hardlinks are not evaluated in TreeSize Free.The personal and professional edition come with an option to explicitly analyze these extended NTFS features, which may make the results more accurate.

I have installed TreeSize Free from the Microsoft Store, how can
I activate the context menu entry in the Windows Explorer?

Apps from the Microsoft Store are executed in a sandbox and can not write to all of the registry. Creating a context menu entry from within TreeSize Free itself is thus not possible.
You can activate the context menu entries manually though. Please find the required entries for the Windows registry at TreeSizeFree_Context_StoreApp_Enable.reg
After downloading the registry file, you may just execute it to show the store version of TreeSize Free in the context menu of the Windows Explorer.
To exclude TreeSize Free from the Windows Explorer's context menu, please download and run TreeSizeFree_Context_Disable.bat.

After using the portable version of TreeSize Free, the Explorer's
context menu includes entries to scan folders and drives with
TreeSize Free.

Why is there any reason for context menu entries with a portable
app and how can I remove these entries?

The option to integrate with the Explorer's context menu is deactivated for the portable version and TreeSize Free would thus not create any entry.
If you want to use a portable version of TreeSize Free and still create context menu entries, you may use the default installed version of TreeSize Free and create an empty file named 'GlobalOptions.xml' in the installation folder. The program folder created this way can be copied and used just like the portable version.
Please be aware that the context menu entries created this way are not being updated or removed if the program folder changes. Such context menu entries may thus become orphaned and should be removed beforehand.
The easiest way to remove the entries again is to deactivate the option on the 'Options' tab.

Yes, scanning network drives is fully supported by the free version in typical home networks, where the computer running TreeSize Free is not part of a Windows domain and the remote system is not a Windows server. The professional edition also supports scans in Windows domains and on Windows server systems.

My system lists TreeSize Free as an installed application, but I
can not remember to have it installed.

We are not aware of any application or software collection, which would install TreeSize Free as 3rd party software without asking. Should you notice such an application, please let us know, so we can investigate the situation.
TreeSize Free does not include any adware and remains completely inactive while not running. You can uninstall and remove TreeSize Free completely using the Windows Control Panel.

I downloaded and installed TreeSize Free and now there are other
programs installed as well.

The official installer for TreeSize Free (as well as the portable version and the version available in the Windows Store) would not install any other applicationand is tested to contain no malware, adware, or similar.
Please assure to download TreeSize Free from trusted sources only, like our official download server at https://www.jam-software.com/treesize_free
Should you believe you have found a conspicuous download source, please let us know.

I installed TreeSize Free, but I can't remember where I installed
it to and the Windows Search / Cortana won't find it as well.

The default installation path for TreeSize Free is C:\Program Files (x86)\JAM Software\TreeSize Free
Windows Search / Cortana would unfortunately not find the installed applications by default, but only its shortcut added to the start menu. To make sure the application is available via the quick search in the start menu, please make sure the start menu entry is being checkmarked for creation during setup.

The name column does not only contain the name, but also the
size, which seems to be redundant.

This results from the basic view without details, where the size information for the current view type (size, allocated, files, percent) is shown before the name of each object.
Having the details shown, you can simply deactivate these values at "Options -> Show preceding values in details view"

With TreeSize Free V4.1, a new type of hints has been introduced:
the folder content preview. Is there a way to disable this popup
window and show the old fashioned hint instead?

Yes, there is:
On the 'Options' tab, click and expand the 'Options' drop down. The first entry of the now shown list ('Tooltips') allows you to chose between the available hint types:
- Only for cut off labels: Only shows a hint, if the content of a cell had to be cropped- Show Long Tooltips: Shows a hint containing detailed information on an element- Show a preview of the current folder's content: Shows a preview window on the current folder
With V4.1.1, the default option for the tooltips has been adjusted, so the folder content preview has to be activated manually.The 'Tooltips' option has been moved to the 'Options' tab also, so it may be accessed more easily.

I really like TreeSize Free, but I'm no big fan of the new ribbon
interface, as it's just too large. Can I switch back to the old
toolbar view?

Yes, you can.If it's just for the height of the ribbon menu, you may first try to minimize it. Just right-click on the menu and select 'Minimize the Ribbon'. Using the right-click menu, you may also add commands to a quick access bar and create a toolbar specialized for your own needs.To disable the ribbon interface completely you may use the command line parameter /UseRibbonUI false since v4.0.2:

Close TreeSize Free

Open the prompt to run a program (shortcut: Win + R)

Type in the path to TreeSizeFree.exe and the required parameter. This usually results in (including the quotation marks): "C:\Program Files (x86)\JAM Software\TreeSize Free\TreeSizeFree.exe" /UseRibbonUI false

With a click on 'Ok' you may now TreeSizeFree without the ribbon interface. This setting is persisted and will be used again at the next start of TreeSizeFree, so you would have to run this command only once.

As an alternative (which works for older versions too), you may change the setting in the GlobalOptions file:

Close TreeSize Free

Locate the file "GlobalOptions.xml" and open it with a texteditor at your choice (like notepad.exe).

When you used the default installer to deploy TreeSize Free, the GlobalOptions.xml should be located at %appdata%\JAM Software\TreeSize Free

For the portable version, the options file will reside in the same folder as the executable

Search for the text "<UseRibbonUI>True</UseRibbonUI>" and replace it with "<UseRibbonUI>False</UseRibbonUI>"

Save the file and close the editor. TreeSize Free will now start without the ribbon interface

To activate the ribbon interface again, please follow the same steps, but replace False with True (e.g. /UseRibbonUI true)

Yes, TreeSize Freee may be used in commercial and enterprise environments. TreeSize Free has the limitation that it cannot scan network drives in Windows domains, this is only possible with the Professional edition. However, please consider purchasing a few licenses of TreeSize Professional to support the further development of all editions.